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...r k, then X[ix[k]] < X[k] < X[ix[k] +1] # also OK with "<=" on either one, but not both This is easy to code by looping over the data in X,Xi, but I suspect there may be a faster and more elegant way to do this in R. In Python (Numeric) the same can be achieved with ix=Numeric.searchsorted(X[1:-1],Xi), which is quite compact. So, does anyone know of a corresponding R call that can achive the same? Sincerely, Halldór -- Halldor Bjornsson Weatherservice R & D Icelandic Met. Office [[alternative HTML version deleted]]

...k, then X[ix[k]] < Xi[k] < X[ix[k] +1] # also OK with "<=" on either one, but not both This is easy to code by looping over the data in X,Xi, but I suspect there may be a faster and more elegant way to do this in R. In Python (Numeric) the same can be achieved with ix=Numeric.searchsorted(X[1:-1],Xi), which is quite compact. So, does anyone know of a corresponding R call that can achive the same? Sincerely, Halldór -- Halldór Björnsson Deildarstj. Ranns. & Þróun Veðursvið Veðurstofu Íslands Halldór Bjornsson Weatherservice R & D Icelandic Met. Office [[alternative...